Mechanism for connecting engine governors and by-pass valves



Feb. 14, 1950 Filed Nov. 20, 1944 T 47 OIL PUMP 2 Sheets-Sheet 1G0verhar s *5 H e H 6 L Q m R l l l l &.

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MECHANISM F'OR CONNECTING ENGINE GOVERNORS AND BY-PASS VALVES Filed Nov.20, 1944 2 Sheets-Sheet 2 IN V EN TOR.

TTORNEY utilized to ignite the gas.

Patented F eb. 14, 1950 MECHANISM FOR CONNECTING ENGINE GOVERNORS ANDBY-PASS VALVES Edward Rathbun, Toledo, Ohio, assignor to The Rathbun-Jones Engineering Company, Toledo, Ohio, a' corporation of OhioApplication November 20, 1944, Serial 564,279

1 Claim. (01. 74-53) This invention relates to high compression internalcombustion engines, but more particularly to such engines which areadapted to operate on gas and oil.

In engines of this character, it is desirable that the amount of oilinjected into the cylinder be controlled in accordance with the loadconditions or demands of service as well as the volume of gas availableat the time. When producer gas .is employed andsince its volume notinfrequently varies from time to time, it becomes necessary during theoperation of the engine to increase the rate of oil supply when thesupply of gas decreases, and on the other hand when the supply of gasincreases, then the rate of oil supply should accordingly be decreased.Of course, when the engine is running idle at no load, the quantity ofoil injected should be slightly less than that necessary to operate theengine, since the oil is This will be readily apparent inasmuch as thetemperature of compression is lower than the ignition temperature of theair-gas mixture but is higher than that of.

fuel oil.

Certain of the above variations can be automatically controlled withinreasonable limits. However, it is a desideratum to produce a simple andefilcient regulator by which the proper proportion of gas and oil isdelivered to the engine, the same to be changed as the available supplyof gas varies, so that the rate of oil delivery may be increased in theevent the available gas is reduced. In this manner the engine can bekept running smoothly regardless of the load imposed upon it andthe fuelor mixtureoffuels supplied to it. i

An object is to produce a new and improved mechanism for connecting .agovernor for a Diesel engine'employing gas and oil and the by-pass valvethereby automatically to control therate of oil injected into the enginein predetermined proportion to the quantity of gas delivered thereto.

Other objects and advantages will hereinafter appear and, for purposesof illustration but not of limitation, an embodimentof the invention isshown in the accompanying drawings, in which Figure 1 is adiagrammaticside elevatiompartly in section of a Diesel engine equippedwith the usual variable speed governor and showing the attachmentthereto for controlling the rate of oil delivered to the cylinders;

Figure 2 is an enlarged side elevation, partly in verti'cal' section,showing the governor attachment, the oil bypass valve assembly and theoperative connection therebetween;

Figure 3 is a view of the governor attachment shown in Figure 2 butadjusted to a position by which the rate of oil delivery is increased;and

Figure 4 is a view of the governor attachment shown in Figure2 adjustedto afford even greater rate ofoildelivery than that shown in Figure 3.

The illustrated embodiment of the invention comprises a Diesel engineIt, only so much being shown as is necessary for an understanding of theinvention. Gas is supplied to the engine through a valve casing I i inwhich is mounted for vertical reciprocatory movements a multiple discvalve I 2. From the valve casing I I, gas flows about a mixing throatI3, to which air is supplied through a pipe I4, containing a butterflytype control valve I5.

inside of the mixing throat I3, which, as shown,

has a bell mouth and a venturi adjacent thereto.

keep the engine speed uniform. Variable speed governors of this type arewell known to those skilled in this art and are ordinarily available inthe open market, one being produced by Woodward Governor Company, ofRockford, Illinois, and referred to'as type U. S. 8 governor.

As shown the governor I6 is arranged within a housing and theoscillatable governor shaft I'I projects beyond opposite sides of'thehousing. Mounted on one end portion of the shaft I! is a pinion IS, withwhich meshes a rack I9 forming a part of a horizontally disposed rackbar 20 slidably mounted in a guide 2|. The opposite end of the rack barabuts against the vertical arm of a a bell crank 22, the horizontal armof which is sively moves the multiple disc valve I2 away from Thus amixture of airy and gas pass to the engine cylinders through the itsseat, thereby to admit a greater volume of gas to the engine cylinders.Movement of the governor shaft I! in the opposite direction operates tomove the gas valve l2 toward its closed position.

Mounted on the opposite end of the governor shaft i! is a disk 21, whichis fixed for movements with the shaft. The disc 21 has an annularperiphery, which has .a, nice rotatable fit within a larger disk 28, aportion of its lower peripheral surface being cut away, as indicated at29. The disks 2'! and 28 are eccentric to each other, it being observedthat the disk 21 is mounted within the disk 28 above the center of thelatter. Having bearing within the eccentric disk 28 is a shaft 30, onwhich is fixed a pinion 3| meshing with teeth 32 formed in a portion ofthe peripheral surface of the disk 21.

On the outer end of the shaft is a handle 33, the turning of which rocksthe outer or eccentric disk 28 in one direction or the other, theinterengagement of the gear teeth retaining the eccentric disk in theposition of adjustment. The inner disk 21 has a pointer mark, to whichnumbered calibrations on the eccentric disk can be selectively moved, aswill hereinafter be eX- plained.

Bearing against the top peripheral surface of the eccentric disk 23 is ashoe 34, the undersurface of which is arcuate to fit the rounded surfaceof the disk. In the upper portion of the shoe 34 and arranged centrallyis a conical recess or bearing 35, into which extends the pointed end36' of a vertical adjusting screw 3?. A nut 38 locks the screw 3'! inadjusted position in the end of an operating lever 39. The lever 39 isfulcrumed close to its opposite end at 4!] and the adjacent end carriesan adjustable contact screw 4!, which abuts against a verticallydisposed stem 42. The stem 42 is provided at its end with a bypass valve43 and a spring 44 urges the valve away from its seat within the valvehousing 45,

Oil is delivered to the bypass housing 45 by a constant deliveryinjection pump 66, which is operated in any suitable manner. From thepump 46 oil is forced thru a tube 4'1, which is connected to the housing45 for delivery of oil to a passage 48, the latter communicating with apassage i811 through which oil passes through a tube :29 to the usualdistributor from whence oil is delivered to the engine cylinders in awell known manner, one tube 5! only being shown leading to one of thecylinders. Communicating with the passage 48a is a passage 52-, which iscontrolled by the bypass valve 43 and which leads to the oil supply (notshown). It will be obvious that the quantity of oil, which is forced tothe distributor 59, is determinedby the position of the valve 43 and,since the delivery of the pump lt is constant, excess oil is bypassedthrough the passage 52 to the oil supply, it being evident that thepassage 52 beyond the valve 43 is larger so that the tendency is for theoil to fiow therethrough. The greater opening afiorded by the bypassvalve 43, the more the quantity of oil delivered to the cylinders isreduced.

In operation it will be understood that the set screw 31 is firstadjusted for proper gas-oil operation, so that the quantity of oil isslightly less than that required to operate the engine on oil aloneunder no load condition. Adjustment is made of the eccentric disk 28 byactuation of the handle 33 in accordance with the prevailing gas supply.If the supply is large, then the eccentric disc 28 is turned so that theindicator mark on the inner disk 21 is on the smaller numberedcalibration on the eccentric disk, such for example as at 2. In thatposition, the oscillating movement of the governor shaft IT, which isthrough an arc of the order of 42, imparts substantially no change inthe vertical position of the shoe 34. Thus, when additional fuel isrequired by the engine and called for by the governor, that is suppliedby gas through operation of the rack bar 20-and associated parts, asabove described.

However, in the event the available gas supply is reduced from thatnecessary for efiicient engine operation, then the eccentric disk isadjusted so that a larger number on the calibrations registers with theindicator mark on the disk 21, such as shown on Figures 3 and 4. In suchposition, the oscillating movement of the governorshaft i! and the disk2'! impart substantial change in the shoe 34, causing it to move up ordown. Such motion is transmitted through the lever 35 to the bypassvalve 43. Upward movement of the shoe 34 effects a closing movement tothe valve 43, thereby causing more oil to be forced to the engine.Downward movement of the shoe 1'4 operates to open the valve and, asabove explained, reduce the oil supply to the engine. Manifestly, theamount of adjustment of the eccentric disk 28 will be arrived atempirically for most satisfactory operation.

In some instances it may be desirable to operate the engine entirely onoil, and this may be accomplished by adjustment of the eccentric disk toa position, such as indicated on Figure 4, by which the oil supply issubstantially increased.

From the above it will bernanifestthat I have provided an exceedinglysimple device for con trolling the delivery of both gas and oil to aDiesel engine. Its marked simplicity not only enables it to be operatedby a comparatively unskilled person but it can be produced at arelatively low cost. The number of moving parts is reduced to a minimum,so that it may be installed readily and conveniently; Furthermore, itwill be evident that adjustments may be eiTected either while the engineisin operation or is idle. It is unnecessary to stop the engine to makeadjustments to reduce or increase the rate of oil delivery, since aslight turn of the operating handle quickly efiects the desired result,both at no load condition, as well as at full load condition andintermediate conditions.

What I claim is:

An adjustable linkage for connecting an oscillatable control shaft to amechanism to be actuated thereby comprising a lever having a fulcrumintermediate its ends, means for operati-vely connecting a first end ofthe lever to-the mechanism in such manner that rocking movement of saidlever about its fulcrum will actuate the mechanism, a first disc formounting concentrically on the control shaft, a second disc having aneccentrically positioned aperture therein in which said first disc ispositioned, a rotatable toothed pinion carried by one of said discs,teeth on the other of said discs meshing with the teeth of said pinionwhereby rotation of said pinion causes relative rotation of said discs,a shoe riding on the periphery of said second disc, and an operativeconnection between said shoe and the second end of said lever.

. 5 EDWARD RATHBUN.

(References I on following page) REFERENCES CITED Number The followingreferences are of record in the file of this patent: UNITED STATESPATENTS 5 Number Number Name Date 792,894 Green June 20, 1905 8:088

Schmidt NOV. 24, 1931 6 Name Date Nordberg June 12, 1934 NonnenbruchFeb. 19, 1935 FOREIGN PATENTS Country Date France June 28, 1933

